<template>
  <el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logOut">退出</el-button>
    </el-header>
    <!-- 页面主主体区域 -->
    <el-container>
      <!-- 左侧区域 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollaose">|||</div>
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="transition"
          router
          :default-active="activePath"
        >
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <template slot="title">
              <i :class="iconObj[item.id]"></i>
              <span>{{item.authName}}</span>
            </template>
            <el-menu-item :index="'/'+ subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+ subItem.path)">
              <i class="el-icon-menu"></i>
              <span slot="title">{{subItem.authName}}</span>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容区 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 菜单数据
      menuList: [],
      // 菜单图标
      iconObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 是否开启折叠动画
      transition: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    // 获取被激活菜单地址
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    //   退出登录
    logOut() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取左侧菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮展开和折叠菜单
    toggleCollaose() {
      this.isCollapse = !this.isCollapse
    },
    // 保存被激活链接
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home_container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0px;
  color: #fff;
  div {
    display: flex;
    align-items: center;
    span {
      font-size: 20px;
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu{
    border-right: none;
    span {
      margin-left: 15px;
    }
  }
}

.el-main {
  background-color: #eaedf1;
}

.toggle-button{
  background-color: #405464;
  color: white;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
